I'm lucky to get an hour and 20 minutes these days. I understand batteries deteriorate over time, but for a year old battery to drop that much? The health of the battery is supposedly "good". Right now I'm on 40%, and I'm getting 40 minutes. That is with everything on idle. I've calibrated the battery a few times this month. I'm disappointed how quickly it has lost its charge - just back in the end of June it was retaining over 2 hours worth. Now it barley makes it over an hour.